feat: raw_tx_by_hash

[loocapro]

Closes: #6760

• eth_getRawTransactionByBlockHashAndIndex
• eth_getRawTransactionByBlockNumberAndIndex

[mattsse]

hmm, I'd prefer keeping the transaction_by_hash

and instead having a new raw_transaction_by_hash() -> PooledTransactionElement

because for these endpoints we don't need the metadata for mined txs, I'm fine with duplicating some code here

[mattsse]

@loocapro for the historical eth_getRawTransactionByBlockHash* calls we can simply reuse the existing transaction_by_hash functions because we don't expect the 4844 sidecar here anymore

[mattsse]

pedantic nit